of members who've chosen an aarp medicare supplement insurance plan insured by unitedhealthcare insurance company. go long. >>> continuing our series on cancer care now, the cost of some of these medicines that we have been talking about can be prohibitive, but i recently spent time at the largest esqccr center, md anderson, and there is a drug they hope will be a new kind of cure. jan chapman volunteers at this pet shelter, helps pets find loving homes. now if you look at her you wouldn't know she has cancer. and when it came back two years ago, the outlook was terrible, she was told she had a one in five chance, that is wn she started treatment at md anderson, with different kinds of medicines. >> i initially had the tumors shrinking, and now, nothing is happeni happening? >> in this case, nothing happening was good news, what did it? the medicine maybe, the difference maker was a drug that jan took initially just to control side effects. >> it is the most commonly used diabetes drug in the country. >> this doctor talks about the drug, millions using the medication to control diabetes.